CVE-2026-67411: RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted…

PriorityP346high7.1CVSS 3.1

AVNACLPRLUINSUCHILAN

EPSS

0.32%

23.6th percentile

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.

Affected

11 ranges

Vendor	Product	Version range	Fixed in
broadcom	rabbitmq_server	>= 3.13.0 < 3.13.18	3.13.18
broadcom	rabbitmq_server	>= 4.0.0 < 4.0.23	4.0.23
broadcom	rabbitmq_server	>= 4.1.0 < 4.1.14	4.1.14
broadcom	rabbitmq_server	>= 4.2.0 < 4.2.9	4.2.9
broadcom	rabbitmq_server	>= 4.3.0 < 4.3.3	4.3.3
rabbitmq	rabbitmq-server	—	—
rabbitmq	rabbitmq-server	—	—
rabbitmq	rabbitmq-server	—	—
rabbitmq	rabbitmq-server	—	—
rabbitmq	rabbitmq-server	—	—
rabbitmq	rabbitmq-server	—	—

CVSS provenance

nvdv3.17.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

nvdv4.06.0MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vendor_redhat7.1HIGH

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